Lateral expansion

The expansion, horizontally, of phosphogypsum or process wastewater storage capacity beyond the permitted capacity and design dimensions of the phosphogypsum stack, or cooling ponds, surge ponds, and perimeter drainage conveyances at an existing facility. Any phosphogypsum stack, cooling pond, surge pond, or perimeter drainage conveyance which is constructed within 2000 feet of an existing phosphogypsum stack system, measured from the edge of the expansion nearest to the edge of the footprint of the existing phosphogypsum stack system, is considered a lateral expansion. (As defined by Chapter 62-673 Phosphogypsum Management)